C# Discussion Boards - CodeProject

7-May-04 8:22

I am hosting a .NET control inside of IE.
Syntax:
<object id="PrintConfig" classid="http:PrintConfig.dll#PrintConfig.PrintConfig" VIEWASTEXT></object>

However, I want my .aspx page to be able to pass params to the PrintConfig.dll, is this possible ? If so, could you point me to a reference or documentation ?

Thanks.

R.Bischoff
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Heath Stewart7-May-04 9:37

7-May-04 9:37

First, your classid attribute should not include "http:". Use a relative path or an absolute path. Only include "http://" plus the host name if you want to use a control from another site (in which case that site needs to be configured in the Url evidence for the code access security group that must be created - all covered in my article I linked the other day.

On your class interface, declare a property of type object or IWebBrowser2 (requires that you reference the shdocvw.dll native COM server, which creates an interop assembly (default is typically Interop.SHDocVw.dll) that must be in the same directory (or if you read the documentation about the assembly binding configuration settings - you can figure out other places to put it) as the PrintConfig.dll.

Make sure you implement this property in your user control.

Then, in your .aspx page for the onload event of your OBJECT (to make sure it's loaded first, otherwise an error will occur), set that property to the window object of the web browser.

You must use a dispatch interface or the scripting engine cannot access the object model. My article I linked also covers this, as well as why auto-generated class interfaces should not be used (declare them explicitly and implement them as the first interface in your class declaration).

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TigerNinja_7-May-04 10:57

7-May-04 10:57

Sorry about that Heath, I just skimmed your article, I should have read more thoroughly. Filling the gap of the .aspx page (server) and the embedded control (local machine) with the web browser interface makes perfect sense.

I'll give it a go!

Thanks again for the tips.

R.Bischoff
.NET, Kommst du mit?

TigerNinja_18-May-04 8:34

Denn Gott hat die Menschen so sehr geliebt, daß er seinen einzigen Sohn für sie hergab. Jeder, der an ihn glaubt, wird nicht verlorengehen, sondern das ewige Leben haben

18-May-04 8:34

Heath Stewart wrote:
Then, in your .aspx page for the onload event of your OBJECT (to make sure it's loaded first, otherwise an error will occur), set that property to the window object of the web browser.

Does OBJECT has an onload event ? During the step of setting the property, say Prop1 to the window object, what does this syntax look like ?

p.s. Is it possible for my .aspx to read values from the embedded c# control ?

thanks again.

R.Bischoff

Heath Stewart18-May-04 9:24

how can I clear out null characters in a string var?

18-May-04 9:24

No, but you could use onreadystatechanged:

<object id="myControl" clsid="MyAssembly.dll#MyNamespace.MyControl"
  onreadystatechanged="setProperties();">
</object>
<script language="javascript">
function setProperties()
{
  if (myControl.readyState == "complete")
    myControl.Prop1 = "something";
}

Don't forget, though, that you can use the <param> tags inside the <object> element to set public properties on the control as well.

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djkno37-May-04 8:03

djkno3

7-May-04 8:03

I read in a chunk of a file in bytes, converted it to ascii, made it a string and now I am trying to clear out the '\0' characters. Any advice?

Re: how can I clear out null characters in a string var?

Jeff Varszegi7-May-04 8:15

Jeff Varszegi

7-May-04 8:15

The simplest single-line call is to do this:

<your string>.Replace('\0'.ToString(), ""));

or

<your string>.Replace("\0", ""));

I would probably recommend stripping unneeded chars as you're reading in the bytes, or when you convert to ascii, if you're doing that work yourself and can find a good place to insert the logic; it'd probably be faster that way.

-Jeff

here, bloggy bloggy

Re: how can I clear out null characters in a string var?

djkno37-May-04 8:17

djkno3

7-May-04 8:17

dammit I knew it was somthing simple like that Wink | ;)

thanks

A theoretical question involving Direct3D

Andres Coder7-May-04 7:59

Andres Coder

7-May-04 7:59

I just started wondering how are those modern 3D RTS-games made. The 3D world structure I mean. How are those 3D mountains (that are not models but can be dynamicalle be altered in runtime) and stuff like that made ...

Isn't there a article somewhere covering something like this ?

Regards, Desmond

Re: A theoretical question involving Direct3D

TigerNinja_7-May-04 8:26

Re: A theoretical question involving Direct3D

7-May-04 8:26

I am not sure, but I think meshes are used.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndrive/html/directx11192002.asp[^]

or try a search on "Managed DirectX"

Good luck

R.Bischoff
.NET, Kommst du mit?

Heath Stewart7-May-04 9:32

Re: A theoretical question involving Direct3D

7-May-04 9:32

Search for books on Amazon about DirectX. I'm reading a couple and they explain a bit of this, though not using the advanced techniques of modern 3D engines for games. That takes experience and deep research into modern game programming.

Microsoft MVP, Visual C#
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Dave Brighton21-Jun-04 1:20

Dave Brighton

21-Jun-04 1:20

No, Mueller hints at this in his book "In Search of the Lost Win32API."
I have not seen anybody actually write code for a Windows Application.
All the texts write their code for Console Applications.

Dave Brighton

How do I send messages to another form

kayhustle7-May-04 7:31

kayhustle

7-May-04 7:31

I want to know how to send data from one form to another? Like lets say I want my program to put data in the textbox of another form, how would I go about doing this?
Thanks,
K

CWIZO7-May-04 7:39

CWIZO

7-May-04 7:39

This was anwserd so many times in thsi forum ...
Search a little.

But the idea is to pass a refrence of the form with the textvox to the form that wants to change that textbox in the constructor.

Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!

Jeff Varszegi7-May-04 7:45

Jeff Varszegi

7-May-04 7:45

Even better, use MVC with or without a Mediator.

-Jeff

here, bloggy bloggy

kayhustle7-May-04 8:10

kayhustle

7-May-04 8:10

Thanks, but what if I didn't create the class for the textbox I want to send to. For example, if I wanted to send info to a text box in a web browser, where I can start the process with the Process class, but how would I access a reference to it?

Heath Stewart7-May-04 9:31

7-May-04 9:31

That's been answered many times as well. You need to get a handle to the process (see the System.Diagnostics.Process class in the .NET Framework SDK) then P/Invoke FindWindow and FindWindowEx to get the window handle (HWND - represented by an IntPtr in .NET) of the control. Then you can P/Invoke SendMessage to send WM_SETTEXT to the HWND with the text you want to set. Search this forum for more information, and see the Platform SDK for details. Previous experience with Windows messaging will definitely be a plus.

Microsoft MVP, Visual C#
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Store encripted passwords

kayhustle7-May-04 9:53

kayhustle

7-May-04 9:53

Thanks alot I saw your previous post with the code. I searched for this, but I wasn't getting back results that applied to what I wanted to do, I guess the keywords I was searching for weren't specific enough.
K

DrGreen7-May-04 7:26

DrGreen

7-May-04 7:26

Hi,

What is the best way to store encripted passwords?

I'm using a simple XML file to store the passwords but I don't know how to store the key used in encriptation in a safe way.

The passwords are to connect to a database, so they need to be tranformed back to the original values.

Thanks

Re: Store encripted passwords

TigerNinja_7-May-04 8:19

Re: Store encripted passwords

7-May-04 8:19

You might want to look up documentation of the following method. I think it is what you are looking for

FormsAuthentication.HashPasswordForStoringInConfigFile

R.Bischoff
.NET, Kommst du mit?

Heath Stewart7-May-04 9:28

7-May-04 9:28

DrGreen wrote:
The passwords are to connect to a database, so they need to be tranformed back to the original values.

That's not a good way to do it. You should store passwords in a one-way hash (like MD5) which someone else mentioned. Instead of sending clear-text passwords across the wire (which can be easily sniffed) and decrypting the passwords from the database to compare, a much more secure approach is to hash the clear-text password and compare that with the password in the database. This can be done better by using a SALT value and other mechanisms to avoid replay attacks.

There are several articles about this here on CodeProject.

Microsoft MVP, Visual C#
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prev/next

Member 10811447-May-04 7:03

Member 1081144

7-May-04 7:03

can anyone tell me to create a prev/next in datagrid. I would like to display record in a datagrid with multiple pages.

thank You

Re: prev/next

Heath Stewart7-May-04 9:26

7-May-04 9:26

I take it this is in reference to ASP.NET's DataGrid? If so, this belongs in the ASP.NET forum. Really, though, the documentation is pretty clear about how to do this and even includes examples.

Microsoft MVP, Visual C#
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Re: prev/next

TigerNinja_7-May-04 11:02